Explosion motor



Dec. 17, 1935. E; MQNDRAGON 2,025,01

EXPLOSION MOTOR Filed Dec. 15, 1932 5 Sheets-Sheet 1 Dec. 17, 135. H MQNDRAGON I 2,025,018

EXPLOS ION MOTOR Filed Dec. 15, 1932 3 Sheets-Sheet 2 Fig.2

42 jnverzior 26 ficiorfl Mwuixaym.

Aiiorrze Dec. 17, 1935-. H. E. MONDRAGON 2,025,018

EXPLOS ION MOTOR Filed Dec. 15, 1932 3 Sheets-Sheet 3 Patented Dec. 17, 1935 OFFlCE EXPLOSIGN MOTOR Hector Eugene Mondragon, Neuiliy-sur-Seine, France Application December 15,

In France December 18,

21 Claims.

This invention relates to explosion motors of the two stroke type, that is to say to explosion motors wherein the power piston receives a motive impulse during each revolution of the shaft.

One object of the invention consists in the provision of a simple and improved arrangement for carrying out the two stroke cycle above mentioned. A. further object of the invention resides in a novel manner of providing ignition of the explosive charge.

These and other objects of the invention will be apparent from the following description read in conjunction with the accompanying drawings which show one embodiment of the invention merely by way of example and in which:

Fig. l is an axial section of the power mechanism taken at right angles to the crank shaft.

Fig. 2 is a longitudinal section thereof through i the axes of the crank shaft and cylinder.

Fig. 3 is a section on line IIL-III of Fig. 2.

Fig. 4 is an enlarged cross section through line IV-IV of Fig, 1.

Referring to the drawings, reference numeral denotes the power cylinder (or expansion cylinder) here shown with an integral head 2. At the upper end of said cylinder and adjacent this head one or more ports 3 are arranged through which burning gases pass during the expansion period and burnt gases during the exhaust period.

Suction and exhaust manifolds designated by 4 and 5 respectively are provided in a member [i which houses the mechanism. Member I1 is carried by crank shaft case i9 and in turn supports casing it of power cylinder I.

A power piston 6 is driven from motor shaft 9 to which it is connected by means of a pin 1', connecting rod 1 (represented by its axis) and crank pin 8.

Adjacent the inlet manifold 4 is formed an annular space It adapted, during the suction period as hereinafter described, to communicate with said manifold and is bounded on its lower side by the upper face of an annular compressor piston i i driven from the shaft 9 through pin [4, connecting rod 53 and crank pin 2. The piston l l slides on a sleeve which forms part of an auxiliary compressor piston it acting as and hereinafter termed a distributor. The space lil is bounded on its upper side by the base 15 of the distributor it which is adapted to slide on the power cylinder l. Space 15 is bounded on its outer side by the inside walls of member ll in which both the distributor it and compressor piston H slide.

Distributor I6 is provided with one or more 1932, Serial No. 647,457

chambers 20, symmetrically disposed around the general axis. Each chamber is formed on its outer face with an inlet port 2! for explosive mixture coming from the annular space Ill during the compression period and on its inner face with 5 port 22 adapted to serve as an outlet towards the power cylinder ports 3 during the explosion and expansion period.

- In order to lead the explosive mixture from the space It to chamber 20 of distributor l6 one or 10 more outside channels or grooves 25 are provided which open into corresponding ports 23 and 24 arranged in member ll. This distributor I6 is driven through pin 28, connecting rod 21 and crank pin 26 of crank shaft 9 and these driving 15 members may all be duplicated as shown.

- Recesses or grooves 29, Figs. 2 and 3, are provided in the walls'of the power cylinder I, to allow for the movements of connecting rod 2'1.

To start the mechanism, one or more spark plugs located in the cylinder head at 3B or in the member H at 3|, are used to produce explosion. In this latter case the plug is located so that the outside distributor ports 21 reach the corresponding port of the spark plug 31 at the same time as the inside distributor ports 22 reach the power cylinder ports 3.

During the compression stroke, the explosive mixture incoming from chamber in may be cooled when going through channels 25 by means of air cooled fins 34 located on the member 33 which forms the outer boundary of said channels. Said fins may even be water cooled, as shown in Fig. 4, at 32 and other fins may be added as shown at '35 and 36, the fins 35 being formed integrally with the walls of member I! (Fig. 4).

Distributor l6 may be made of two parts H5 and lB fitted together and held by bolts or screws 31. The sleeve formed by the part l6 slides around the outer walls of power cylinder I. Besides ports 22 this sleeve is provided with one or more ports 38 which together with channels 39 mounted on the upper part of I6 and with exhaust manifolds 5, form one or more outlets for burnt gases from the power cylinder when said 45 ports 38 are in communication with the cylinder ports 3, during the exhaust period.

Crank pins l2 driving compressor piston l l and crank pins 25 driving distributor it are so set with regard to power piston crank pin 8 that the former leads said crank pin 8 by a small angle a while pin 23 lags behind said pin 8 by an angle ,8, the total angle 6 being as near a right angle as possible (see Fig. 1 where rotation is clockwise). Piston rings are used wherever necessary to ob- .55

spark plug port 3|.

' tributor I6.

The operation of the mechanism above described is as follows:

Owing to the small value of lead angle a the two pistons II and 6 travel almost together in either direction upwards or downwards.

In Fig. 1 the mechanism axis is supposed to be vertical and the distributor at its bottom dead centre. Compressor piston II and power piston 5 are shown going upwards, during the compression and the exhaust periods respectively.

On the compressor side, the explosive mixture sucked in to the chamber Ii during part of the preceding revolution is gradually forced into chambers 20 through ports 23 channels. 25, ports 2G and 2%, as the distance between the top of piston I I and the base 15 of the distributor is constantly decreasing.

On the power cylinder side, piston 6 is expelling burnt gases of cylinder I to the atmosphere through ports 3 and 38, channels 39 and manifolds 5.

Distributor It commences its upward movement while pistons 6 and I I still move upwardly.

On the compressor side the travel of piston iI relatively to distributor I6 decreases and reaches its minimum when the respective velocities are equal and the top of piston II nearly touches the bottom part I5 of the distributor which marks the end of the compression period. At this moment the lower edge of port 2| just reaches the upper edge of port 24, piston ring 48 prevents any further communication between chambers 26 and the compressor side while piston ring 42 prevents communication of chamber 28 with the power cylinder.

On the power cylinder side the exhaust period still goes on. On the compression 'sidethe distributor It still continues its upward movement and the travel of piston II relatively to distributor I6 begins to increase steadily from the above mentioned minimum value. When the lower edge I5 of the distributor piston reaches the lower edge of manifold 4, the suction period begins, the gas being drawn directly from the carburettor for instance, while there is as yet no communication between chambers 20 and power cylinder I.

On the power cylinder side the exhaust stroke is nearing its end. Distributor it continues its upward travel until the lower edges of ports 38 reach the upper edges of ports 3, thus terminating the exhaust period. Power piston 6, still rising, will then compress burnt gases against cylinder head 2 of cylinder I, thus increasing their temperature. During this period, the upper edges of port 22 in sleeve Is have reached the lower edges of port 3 thus causing communication between chambers 29 and the interior of cylinder I, also ports 2i have been brought opposite to the The compressed explosive gases in chambers 20 are then'ignited either by spark plug 3i when the power mechanism is cold, or by contact through ports 3 with superheated compressed burnt gases. This latter alternative called ignition through secondary compression,

may be facilitated by the insertion in the member 35] in the cylinder head of one or more well insulated metal points which remain red hot during operation. Angle or may be chosen to be suitable for either manner of producing the explosion.

Piston 5 reaches then its top dead centre and begins its downward movement in the expansion period of the cycle.

n the compressor side during the same upward movement of distributor IS the suction period has been continuing. Then the distributor comes to its top dead centre and starts on its downward movement, the expansion period still continuing.

On the compressor side the relative travel be- 10' tween piston I I and distributor I6 now reaches a maximum value. When the lower edge I5 of the distributor piston reaches the lower edge of manifold 4, the suction period is ended which takes place shortly after the maximum value. This period of time is calculated so that chamber III will be filled with an explosive mixture at atmospheric pressure, for full speed of the power mechanism, the relative travel being taken as about equal to that of the compressor piston II alone.

During the same downward travel of distributor It the lower edge of port 38 reaches the upper edge of port 3 and opens the exhaust, thus ending the expansion period at the time when piston 6 approaches its bottom dead centre, the upper edge of port 22 having previously passed the lower edges of port 3 thus cutting off the communication between chambers 23 and power cylinder I. These chambers are again isolated from both the compressorand power cylinder until the lower edges of distributor port 2i reaches the upper edge of port 24 in member II. At this moment the suction period has just ended and explosive mixture is once: more forced into chambers 20 from 38 chamber Iii through ports 2% and 24 and channels 25.

During this downward movement of distributor I6 power piston ii has reached its bottom dead centre and has started on its up travel, the ex- 40 haust period thus continuing.

Then the distributor reaches its bottom dead centre the differential compressor and power pistons doing independently their work of compressing and exhausting respectively and the whole 4 cycle begins again.

What I claim is:-

1. An explosion motor of the two stroke type described including in combination a power cylinder, a power piston movable within said cylinder, an annular auxiliary piston sliding on the outer surface of said cylinder and provided'with a chamber in its walls, said chamber having an outlet port on its inner wall and an inlet port on its outer wall, a compressor piston sliding around said cylinder and arranged so as to form an annular space between said compressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft, said means being relatively so disposed as to produce relative movement between said three pistons during each revolution, a housing surrounding said auxiliary and compressor pistons formed with a channel and inwardly directed spaced outlets for said channel, said channel and said outlets forming connecting means for said space and the inlet port of said chamber at one period of the travel of said auxiliary piston, means to allow introduction of an explosive mixture into said space at one period of each revolution and means to connect said chamber with the interior of said cylinder at a further period of each revolution.

2. An explosion motor of the two stroke type described, including in combination a power cylinder having a single gas opening, a power piston movable within said cylinder, an annular auxiliary piston sliding on the outer surface of said cylinder and provided with a chamber in its walls, a compressor piston sliding around said cylinder and arranged so as to form an annular space between said compressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft, said means being relatively so disposed so as to produce relative movement between said three pistons during each revolution, said chamber having an outlet port adapted to coincide with said gas opening at one period of the movement of said auxiliary piston and having an inlet port, a housing surrounding said auxiliary and compressor pistons formed with a channel and inwardly directed spaced outlets forming connecting means between said space and the inlet port of said chamber at another period of travel of said auxiliary piston and means to introduce an explosive charge into said space at a further point of the travel of said auxiliary piston.

3. An explosion motor of the two stroke type described, including in combination a power cylinder having a single gas opening, a power piston movable within said cylinder, an annular auxiliary piston sliding on the outer surface of said cylinder and provided with a chamber in its walls and with an aperture coinciding with said gas opening adjacent the lower limit of movement of said auxiliary piston, a compressor piston sliding around said cylinder and arranged so as to form an annular space between said compressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft, said means being relatively so disposed so as to produce relative movement between said three pistons during each revolution, said chamber having an outlet port adapted to coincide with said gas opening at one period of the movement of said auxiliary piston and having an inlet port, a housing surrounding said auxiliary and compressor pistons formed with a channel and inwardly directed spaced outlets forming connecting means between said space and the inlet port of said chamber at another period of travel of said auxiliary piston, and means to introduce an explosion charge into said space at a further point of the travel of said auxiliary piston.

4. An explosion motor of the two stroke type described, including in combination a power cylinder having a single gas opening, a power piston movable within said cylinder, an annular auxiliary piston sliding on the outer surface of said cylinder and provided with a chamber in its walls and with an aperture coinciding with said gas opening adjacent the lower limit of movement of said auxiliary piston, a compressor piston sliding around said cylinder and arranged so as to form an annular space between said compressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft, said means being relatively so disposed so as to produce relative movement between said three pistons during each revolution, said chamber having an outlet port adapted to coincide with said gas opening at one period of the movement of said auxiliary piston and having an inlet port, a housing surrounding said auxiliary and compressor pistons formed with a channel and inwardly directed spaced outlets forming connecting means between said space and the inlet port of said chamber at another period of travel of said auxiliary piston, said housing hava further point of the travel of said auxiliary 5- piston.

5. An explosion motor of the two stroke type described including in combination apower cylinder, a power piston movable within said cylinder, an annular auxiliary piston sliding on the 10.

outer surface of said cylinder and provided with a plurality of chambers symmetrically peripherally spaced within its walls, a compressor piston sliding around said cylinder and arranged so as to form an annular space between said com- 15 pressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft, said means being relatively so disposed so as to produce relative movement between said three pistons during each revolution, 20 said chamber having an outlet port adapted to coincide with said gas opening at one period of the movement of said auxiliary piston and having an inlet port, a housing surrounding said auxiliary and compressor pistons formed with a 25 channel and inwardly directed spaced outlets forming connecting means between said space and the inlet port of said chamber at another period of travel of said auxiliary piston and means to introduce an explosive charge into said 30 space at a further point of travel of said auxiliary piston.

6. An explosion motor of the twostroke type described, including in combination a power cylinder, a power piston moving within said cylinder, 36 an annular auxiliary piston sliding on the outer surface of said cylinder provided with a chamber in its walls and having portions of different diameters, a compressor piston sliding on said portion of smaller diameter so as to form an annular 0 space between said compressor piston and said auxiliary piston, a crank shaft, means to connect each of said pistons to said crank shaft said means being relatively so disposed as to produce -relative movement between said three pistons dur- 45 ing each revolution, means to allow introduction of an explosive mixture into said space at one period of each revolution, means connecting said space with said chamber at another period of each revolution and means to connect said cham- 50 her with the interior of said cylinder at a further period of each revolution.

'7. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said 55 compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being 60 an auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative move- 65" haust of the burned and expanded gasesfrom the power cylinder ata further period of each, revolution.

bervwith the power cylinder at another period of;

each revolution and means for allowing the ex:

8. A two stroke explosion engine including in combination a power cylinder, a power piston, a

compressor for the explosive mixture, the saidv compressor including two annular pistons distinct from the power piston and arrangedin a-housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor pistonv provided with an explosive chamber in its walls, an inlet port in the outer wall of the said chamber for the admission of the compressed explosive mixture, an outlet port in the inner wall of the same chamber for the admission of, the power mixture into the power cylinder, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so dis- 7 posed as to produce relative movements between said three pistons duringv each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution and means for allowing the exhaust of the burned and expanded, gases from the power cylinder at a further period of each revolution.

9. A two stroke explosion engineincluding in combination a power cylinder, a power piston, a

compressor for the explosive mixture, the said auxiliary compressor piston provided with an explosive chamberin its walls, an inlet port in the outer wall of the said chamber for the admission of the compressed explosive mixture, means for igniting the explosive mixture in the explosive chamber, an outlet port intheinner wall of the same chamber for the admission of the compressedand ignited mixture into the power cylinder, a crank shaft, means for connecting eachof the three above pistons to said crank shaft, said means being relatively so disposed so as to, produce relative movements between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution and means for allowing the exhaust of'the burned and expanded gases from the power cylinder at a further period of each revolution. r

10. A two stroke explosion engine including in combination a power cylinder provided with an opening for the admission and the exhaust of the gases into and out of the said cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls and a port arranged through an extension wall of the said piston for the exhaust of the burned and expanded gases from the power cylinder, a crank shaft, means for connecting each 'of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistonsv during each revolution of the crank shaft, means into the space included between both annular pistons of the compressor at one period of each revolution-of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution.

IL A two stroke explosion engine including in combination a power cylinder, at power piston, a compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being anauxiliary compressor piston provided with an explosive chamber in its walls, the said auxiliary compressor piston being sliding on the power cylinder and provided with a cylindrical extension, on which the main compressor piston is gliding, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pismeans for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution.

12. A two stroke explosionengine including in combination a power cylinder, a power piston, a

compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft; said means including a crank pin driving the main compressor piston, a. crank pin driving the auxiliary compressor piston, these crank pins being so set with regard to the power piston crank pin that the former of the said crank. pins leads the power piston crank pin by a small angle while the second of the said crank pins lags behind said former by an angle of about 90, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive cham ber with the power cylinder at another period of each revolution and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution.

13. A two-stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution, means for igniting the explosive mixture during the connection of the explosive chamber of the auxiliary compressor piston with the power cylinder and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution,

14. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution, means for igniting the explosive mixture, the said means being arranged in the housing surrounding the compressor pistons and in front of an inlet port of the explosive chamber when the same is in connection with the power cylinder and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period 5 of each revolution.

15. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons dis- {0 tinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with 15 an explosive chamber in its wall, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistons during each 20 revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution' of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution, means arranged in the power cylinder for igniting the explosive mixture during the connection of the explosive chamber with the said power cylinder and means for allowing the exhaust of the burned and expanded gases from 35 the power cylinder at a further period of each revolution.

16. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said 40 compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an 45 auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements 50 between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of the crank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution, means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution, means for compressing at the end of the exhaust period 65 one part of the said burned and expanded gases at a pressure and temperature sufficiently high for igniting by contact the compressed explosive mixture enclosed in the explosive chamber of the auxiliary compressor piston when the said 70 explosive chamber is connected with the power cylinder.

17. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mixture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for admitting the compressed explosive mixture into the explosive chamber of the auxiliary compressor piston at another period of each revolution of thecrank shaft, means for connecting said explosive chamber with the power cylinder at another period of each revolution and an exhaust'port arranged in an extension wall of the auxiliary compressor piston, the said exhaust port being so arranged as to allow the exhaust of the burned andexpanded gases from the power cylinder at-a further period of each revolution, and to cut the said exhaust before the end of the exhaust stroke of the power piston, in order to compress in the power cylinder-the remainingburned gases at a pressure'and temperature sufficiently high for igniting'the next explosive charge when the said explosive chamber will be connected with the said power-cylinder.

18. A'two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including 'two annular pistons dis tinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main'compressor piston and the other being an auxiliary compressor pistonprovided with an explosive chamber in its walls, the said explosive chamber being made of a series of compartments symmetrically arranged around the axis of the power cylinder, a crank shaft, means for connecting each ofthe three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movements between said three pistons during each revolution of the crank shaft, -means for allowing introduction of an explosive mixture into the space included between both of each revolution,

19. A two stroke explosion engine including in combination a power cylinder, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons dis- 'tinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a'main compressor piston and the other being an auxiliary compressor piston provided with an explosive chamber in its walls and an extension wall through which is arranged the exadmission of the explosive mixture in the comhaust port for the burned and expanded gases, a crank shaft, means for connecting eachof the three above pistons to said crank shaft,- said means being relatively so disposed as to produce 5 relative movements between said three pistons during each revolution of the crank shaft, means for allowing introduction of an explosive mix,- ture into the space included between both annular pistons of the compressor at one period of each revolution of the crankshaft, means for ad- 1 mitting'the compressed explosive mixture in the explosive chamber of the auxiliary piston at another period of each revolution of the crankshaft, means for connecting said explosive chamber with the power cylinder at another period of each 1 5 revolution, and the exhaust port for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution being provided with a channel positioned in front of a manifold of the vhousing of the engine during the said exhaust period. 20. A two stroke'explosion engine including in combination a power cylinder, a power piston,

a compressor-for the explosive mixture, the said compressor including two annular pistons distinct from the power piston and arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being a main compressor piston and the other being an auxiliary compressor piston provided with anexplosive chamber in its walls, a crank shaft, means for connecting each of the three above pistons to said crank shaft, said means being relatively so disposed as to produce relative movementspression chamber of the compressor and the inlet port of the explosive chamber, means for connecting said explosive chamber with the power cylinder at another period ofeach revolution and means for allowing the exhaust of the burned and expanded gases from the power cylinder at a further period of each revolution.

21. A two stroke explosion engine including in combination a power cylinder provided with an opening for the admission of the gases into the same and the exhaust of the burned and expanded gases out of the same, a power piston, a compressor for the explosive mixture, the said compressor including two annular pistons arranged in a housing surrounding coaxially the said power cylinder, one of the said compressor pistons being an auxiliary compressor piston slid-- ing on the power cylinder and provided with,,on the one hand, an explosive chamber in its wall, on another hand, a cylindrical extension wall on which the main compressor piston is-gliding and on athird hand, an opposite extension wall through which is arranged an exhaust port :for the burned and expanded gases, an inlet port in the housing of the compressor pistons for the pression space included between both compressor pistons at one period of each revolution of the crank shaft of the engine, an inlet port in the outer wall of the explosive chamber of the auxiliary compressor piston for the admission into the said chamber of the compressed explosive mixture, a channel arranged in the housing of the compressor pistons with its both ends opened in the inner wall of the said housing and forming a connection between the compression chamber of the compressor and the inlet port of the above explosive chamber at another period of each revolution of the crank shaft of the engine, the said crank shaft, means for connecting each of the three above pistons to said crank shaft, said means including a crank pin driving the main compressor piston, a crank pin driving the auxiliary compressor piston, these crank pins being so set with regard to the power piston crank pin that the former of the said crank pins leads the power piston crank pin by a small angle while the second of the said crank pins lags behind said former by an angle of about 90, an outlet port in the inner wall of the explosive chamber for connecting the said chamber with the opening of the power cylinder at a third period of each revolution of the above crank shaft, means for igniting at that time the compressed explosive mixture enclosed in the explosive chamber of the auxiliary compressor piston, means for registering the opening of the power cylinder with the exhaust port of one of 10 the extension walls of the auxiliary compressor piston at a fourth period of each revolution of the engine, and a corresponding port arranged in the outer housing of the compressor pistons for the escape of the said gases. 1

HECTOR EUGENE MONDRAGON. 

